Disconnecting negative battery cable...
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Pole Position
Joined: Sep 2005
Posts: 215
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From: kjhklh
Disconnecting negative battery cable...
I just installed the Greddy SP2 exhaust and the Joe-Z intake. I really didn't want to disconnect the negative battery terminal because I didn't want to lose my nav address book. The thought of having to manually adding all my contacts again is something that I didn't want to do.
So my question is how important is it? Will the computer eventually learn of my new equipment and adjust its sensors accordingly after a few hundred miles, or is it necessary to disconnect to maximize efficiency?
TIA
So my question is how important is it? Will the computer eventually learn of my new equipment and adjust its sensors accordingly after a few hundred miles, or is it necessary to disconnect to maximize efficiency?
TIA
Lead Lap
Joined: May 2006
Posts: 688
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From: Ottawa,Ontario
I though reseting the EFI and ETCS fuses was only to get the car to re-learn the gear selection patterns? Lobux mentioned one would need to reprogram the actual ECM if they want the engine to "work right" after these kinds of mods.
CL Community Team
Joined: Apr 2004
Posts: 17,329
Likes: 210
From: Miami, Florida
It depends on the types of modifications. With all the custom exhaust work and intake work, I have had initially a few P0171 lean errors, but nothing since. However, I could get MORE out of them if I reprogrammed th ECM.
The computer eventually does learn, but as I said it can be improved with tinkering with the ECM.
The computer eventually does learn, but as I said it can be improved with tinkering with the ECM.
Lead Lap
Joined: May 2006
Posts: 688
Likes: 0
From: Ottawa,Ontario
You missed this post nrsk4u.
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It depends on the types of modifications. With all the custom exhaust work and intake work, I have had initially a few P0171 lean errors, but nothing since. However, I could get MORE out of them if I reprogrammed th ECM.
The computer eventually does learn, but as I said it can be improved with tinkering with the ECM.
The computer eventually does learn, but as I said it can be improved with tinkering with the ECM.
To answer why you would reset the ECM - it restores the correction factors to zero and starts the learning process for the fuel maps all over again. Ideally, you'd be able to modify the base values in the map to take advantage of the places where your mod is working best, but Toyco doesn't give us the information we need to do this sucessfully.
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CL Community Team
Joined: Apr 2004
Posts: 17,329
Likes: 210
From: Miami, Florida
Keep in mind, the ECM can only modify the fuel values by a 20% correction. If you do mods that add more than 20% airflow, you'll be short on fuel unless you put in bigger injectors, and that brings its own set of issues.
To answer why you would reset the ECM - it restores the correction factors to zero and starts the learning process for the fuel maps all over again. Ideally, you'd be able to modify the base values in the map to take advantage of the places where your mod is working best, but Toyco doesn't give us the information we need to do this sucessfully.
To answer why you would reset the ECM - it restores the correction factors to zero and starts the learning process for the fuel maps all over again. Ideally, you'd be able to modify the base values in the map to take advantage of the places where your mod is working best, but Toyco doesn't give us the information we need to do this sucessfully.
I'm not a big eManage fan. The people I know and trust have had some very bad experiences with them, mostly because they occasionally fail to load the ignition maps. The typical result is the engine detonating to death very quickly.
I've only known a couple of people who have had consistently good results with them.
I've only known a couple of people who have had consistently good results with them.
CL Community Team
Joined: Apr 2004
Posts: 17,329
Likes: 210
From: Miami, Florida
I'm not a big eManage fan. The people I know and trust have had some very bad experiences with them, mostly because they occasionally fail to load the ignition maps. The typical result is the engine detonating to death very quickly.
I've only known a couple of people who have had consistently good results with them.
I've only known a couple of people who have had consistently good results with them.
We have a monthly bracket competition this Sunday I help run (and sometimes win
, and within I would say the last two years, I have seen a profound increase in the number of people making adjustments with their hooked up laptops. After seeing the results on the track, some would be better off tuning via other means as it seems they look to the eManage or other as the solution to all their problems.
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